Bird cage barrier



FIG. 1 is a perspective view of the bird cage barrier having a round cross-sectional profile;

FIG. 2 is a side view of the bird cage barrier of FIG. 1;

FIG. 3 is a top view of the bird cage barrier of FIG. 1; and,

FIG. 4 is a bottom view of the bird cage barrier of FIG. 1. 

The ornamental design for a bird cage barrier, as shown and described. 